Electromagnetic device

Abstract

An electromagnetic device adapted to operate with a battery of small capacity and having an armature arranged to move upon energization and de-energization of a coil, to and away from a yoke respectively. In order to insure that, after having been attracted, the armature is in intimate contact with the yoke over the entire prescribed area of interface therebetween, there is provided an annular elastic spacer which may be of round cross-section secured in an annular recess around a pivot pin for the armature at the center of length thereof and fitted in a vertical hole of the armature to permit not only absorption of the shock on the armature, thus protecting the attraction face, but also tilting movement of the armature about the spacer ring with respect to the yoke.

What is claimed is: 
     
       1. An electromagnetic device comprising: an armature adapted to be electromagnetically energized including a top face, a bottom face and means defining a hole extending continuously through said armature from said top face to said bottom face; an armature lever mounted for rotative movement; a pivot axle formed with a circumferential groove on the outer periphery thereof fixedly mounted upon said armature lever and having said armature mounted thereon, said pivot axle extending through said armature hole and having an outermost diameter smaller than the diameter of said armature hole to define a gap therebetween; spring means applying to said armature lever a spring biasing force in a direction counteracting the force applied thereto by electromagnetic energization of said armature, said counteracting spring biasing force being weaker than the force applied by said electromagnetic energization of said armature; and a body of resilient material secured in said gap between said pivot axle and said armature hole to resiliently support said armature relative to said armature lever. 
     
     
       2. An electromagnetic device according to claim 1 wherein said resilient material is filled in said gap between said armature hole and said pivot axle. 
     
     
       3. An electromagnetic device according to claim 1 wherein said body of resilient material is formed with an annular configuration having a circular cross section and wherein said body is secured within said circumferential groove on said armature periphery. 
     
     
       4. An electromagnetic device according to claim 1 which includes an electromagnet having an attraction face and wherein said armature includes an attraction face, said device further including spring means interposed between said armature lever and said armature to apply a spring force tending to impel said attraction face of said armature to said attraction face of said electromagnet. 
     
     
       5. An electromagnetic device according to claim 1 wherein said pivot axle is formed with an upper section above said circumferential groove and with a lower section below said groove, said lower section having a larger diameter than said upper section.